Planting potatoes too close together is one of the biggest mistakes gardeners can make, as having enough space for the plant to develop is essential for a large, healthy crop.
Additionally, moisture and humidity levels increase when the plants are crowded, creating the ideal environment for fungal diseases such as late blight.
Plant them six to eight inches into the soil. Smaller varieties, like Yukon Gold, can be spaced about eight inches apart, while larger ones, like Russet, should be 20 inches apart.